Hello Rik, LF

Not a NAVTEX related reply, but perhaps still relevant to all of us on the list:

ARD is quite strong at times even up here in Finland. I have wondered many times
why ARD is no threat to the NAVTEX service and why airplanes don't fall out of
the sky when there is a strong NAVTEX transmission on and someone is using
ARD's signal while being at the outer limit of the service range.

It would be interesting to see the calculations / assumptions made when
co-ordinating these services. Especially with WRC-2012 getting closer day by
day.

Just a thought.

BR

Paul-Henrik, OH1LSQ




Quoting Rik Strobbe <[email protected]>:

> All,
>
> here too. I installed YAND and let it running overnight (starting 22UTC).
> Besides a whole bunch of European NAVTEX stations (including Greenland,
> Iceland and Russia), mediteranian (Turkey, Israel, Egypt and Algeria) I also
> copied VCO (Sydney, Canada), NMN (Chesapeake, USA) and NMG (New Orleans,
> USA). The last one is the ODX at 7789km.
> Also a lot of UNID, I'll have a look tonight wether the received text reveals
> the origin.
>
> My main problem in receiving 518kHz NAVTEX is the Romanian NDB "ARD" on
> 517kHz with a 1kHz tone modulation. Thus the upper sideband on 518kHz, just
> inbetween the mark and space of NAVTEX.
> I notched it out, but that seems also to affect (desense) the NAVTEX
> decoding.
>
> 73, Rik  ON7YD - OR7T
>
> ________________________________________
> Van: [email protected] [[email protected]]
> namens [email protected] [[email protected]]
> Verzonden: maandag 13 december 2010 6:25
> Aan: [email protected]
> Onderwerp: RE: LF: Re: China on 518kHz Navtex
>
> Hello lf,
>
> used YAND the first time,messages from New Orleans and Miami,about 7500KM,
>
> 73
>
> Victor
>
> -----Oorspronkelijk bericht-----
> Van: [email protected]
> [mailto:[email protected]]Namens John GM4SLV
> Verzonden: zondag 12 december 2010 22:05
> Aan: [email protected]
> Onderwerp: Re: LF: Re: China on 518kHz Navtex
>
>
> Louis,
>
> I use YaND (Yet another Navtex Decoder) by Dirk Claessens, as mentioned
> by Jan PA3ABK in another message here..
>
> It is very good, and has extra features for automatically identifying
> the station being received, collating reception reports etc etc.
>
> It is available here:
> http://users.telenet.be/NAVTEX/YAND/
>
> as well as from the files section of the Yahoo group "Navtexdx"
>
> I would recommend trying it!
>
> John
> GM4SLV
>
>
> On Sun, 12 Dec 2010 19:59:13 +0100
> "L.v.Erck" <[email protected]> wrote:
>
> > GE JOHN!
> >
> > WHAT PROGRAM DO YOU USE TO DECODE NAVTEX? MUST BE A GOOD ONE.  MINE
> > WONT PHASE EVEN WHEN SIGNAL IS S9 ++++++++
> >
> > 73 LOUIS/PAoLCE.
> >
> > ----- Original Message -----
> > From: "John GM4SLV" <[email protected]>
> > To: <[email protected]>
> > Sent: Sunday, December 12, 2010 1:50 PM
> > Subject: LF: China on 518kHz Navtex
> >
> >
> > > Hello,
> > >
> > > Slightly Off Topic, but last evening I received a Navtex
> > > transmission from China on 518kHz, a distance of 9061km and at an
> > > early time of 1811UTC.
> > >
> > >
> > > 20101211 1811 518 $11N XSQ Guangzhou,CHN   9061
> > >
> > > Here's the decoded text....
> > >
> > > 18:10:21> ZCZC NA99
> > > 18:10:23> 091953UTC DEC 2010
> > > 18:10:27> GUANGZHOURADIO/XSQ
> > > 18:10:27>
> > > 18:10:35> TN/W GUANGZHOU NR281/0210 CK53/50 10 0340L
> > > 18:10:40> NAVIGATIONAL WARNING (IMPORTANT)
> > > 18:10:43> TO ALL SHIPS
> > > 18:10:53> GD0210 SOUTH CHINA SEA IT IS REPORTED NAN AO 13016 WITH 3
> > > CREW 18:11:03> CARRYING OUT HYDROGRAPHIC SURVEY IN POSN 1958N
> > > 11443E ON 30 18:11:31> NOV AND LOST CONTACT PASSING VESSELS ARE
> > > REQUESTED TO KI~~~~~~~~~{}
> > >
> > >
> > > Keep an ear out for other far-east MF signals -- I believe 500kHz is
> > > still used commercially over there.
> > >
> > >
> > > Cheers,
> > >
> > > John
> > > GM4SLV
> > >
> >
> >
>